*{
    padding: 0;
    margin:0;
}
/* body{ */
    /* display: flex;
    align-items: center;
    justify-content: center;
    background-color: beige; */
:root{
    --color-primary: #112339;
    --color-white: #e9e9e9;
    --color-black: #116bd9;
    --color-black-1: #212b38;
    --color-yellow: rgb(222, 139, 71);
}
*{
    margin: 0;
    padding: 0;
    /*标准盒子*/
    box-sizing: border-box;
}
body{
    font-family: sans-serif;
    background: var(--color-white);
    
    /*background-size: cover;*/
}

p{
    font-family: '方正兰亭';
}
/*设置logo属性*/
.logo{
    color: var(--color-white);
    font-size: 45px;
}
.logo span{
    color: var(--color-primary);
}
/*第一个div*/
.menu-bar{
    background-color: var(--color-black);
    height: 100px;
    width: 100%;
    display: flex;
    /*让列表移到右边去*//*均匀的分配每一个元素*/
    justify-content: space-between;
    /*让文字居中*/
    align-items: center;
    padding: 0 5%;
    /*绝对定位*/
    position: absolute;
}
/*ul*/
.menu-bar ul{
    list-style: none;
    display: flex;
}
/*li*/
.menu-bar ul li{
    /*width: 120px;*/
    padding: 10px 20px;
    /*text-align: center;*/
    position: relative;
}
/*a*/
.menu-bar ul li a{
    font-size: 25px;
    color: var(--color-white);
    /*取消下划线*/
    text-decoration: none;
    transition: all 0.3s;
}
.menu-bar ul li a:hover{
    color: #000;
}
/*让下拉列表平铺*/
.dropdown-menu{
    display: none;
}
.menu-bar ul li:hover .dropdown-menu{
    display: block;
    /*绝对定位*/
    position: absolute;
    z-index: 999;
    left: 0;
    top: 100%;
    background-color: var(--color-black);
}
.menu-bar ul li:hover .dropdown-menu ul{
    display: block;
    margin: 10px;
}
.menu-bar ul li:hover .dropdown-menu ul li{
    width: 150px;
    padding: 10px;
}

.biaotou{
    display: flex;
    justify-content: center;
    align-items: center;
}
.toubu{
    list-style: none;
}
.biaotou img{
    margin-top: 20px ;
    width: 500px;
}
section{
    border:1px solid var(--color-white);;
    /* position: relative;
    top: 250px;
    right: 2.5%;
    left: 2.5%; */
    /* height: 1500px; */
    overflow: hidden;
    margin: 20px;
    padding: 20px;  
    display: flex; 
    justify-content: center;
    /* align-items: center; */
}
.bleft{
    width: 720px;
    /* ,: left; */
    background-color: white;
    margin-right: 10px;
    top: 0;
}
.bright{
    border:2px  solid rgb(69, 63, 63);
    width: 720px; 
    /* float: right; */
    height: 100%;
    background-color: bisque;
    margin-left: 10px;
}
.lbx1{
    border: 2px solid rgb(69, 63, 63);
    padding: 0px;
    letter-spacing: 4px;
}
.lbx2{
    border: 2px solid rgb(48, 43, 43);
    padding: 0px;
    letter-spacing: 2px;
}
.lbx2 p{
    text-indent: 2rem;
}
.rbx1{
    /* border:2px 2px 2px 2px solid rgb(69, 63, 63); */
    padding: 10px;
    letter-spacing: 1px;
    /* margin-top: 20px; */
}
.rbx2{
    /* border: 2px 2px 2px 2px solid rgb(69, 63, 63); */
    padding: 0px;
    letter-spacing: 1px;
    margin-top: 75px;
}
.rbx3{
    /* border: 2px 2px 2px 2px solid rgb(69, 63, 63); */
    padding: 10px;
    letter-spacing: 1px;
    margin-top: 52px;
}
.logo{
    color: var(--color-white);
    font-size: 45px;
}
.logo span{
    color: var(--color-primary);
}
/*第一个div*/
.menu-bar{
    background-color: var(--color-black);
    height: 100px;
    width: 100%;
    display: flex;
    /*让列表移到右边去*//*均匀的分配每一个元素*/
    justify-content: space-between;
    /*让文字居中*/
    align-items: center;
    padding: 0.1%;
    /*相对定位*/
    position: relative;
}
/*ul*/
.menu-bar ul{
    list-style: none;
    display: flex;
}
/*li*/
.menu-bar ul li{
    /*width: 120px;*/
    padding: 10px 20px;
    /*text-align: center;*/
    position: relative;
}
/*a*/
.menu-bar ul li a{
    font-size: 25px;
    color: var(--color-white);
    /*取消下划线*/
    text-decoration: none;
    transition: all 0.3s;
}
.menu-bar ul li a:hover{
    color: var(--color-black-1);
}
/*让下拉列表平铺*/
.dropdown-menu{
    display: none;
}
.menu-bar ul li:hover .dropdown-menu{
    display: block;
    /*绝对定位*/
    position: absolute;
    z-index: 999;
    left: 0;
    top: 100%;
    background-color: var(--color-black);
}
.menu-bar ul li:hover .dropdown-menu ul{
    display: block;
    margin: 10px;
}
.menu-bar ul li:hover .dropdown-menu ul li{
    width: 150px;
    padding: 10px;
}

footer{
    margin: 0;
    padding: 0;
    /* background: #868686; */
    height: 250px;
}
footer .down{
    width: 1500px;
    height: 250px;
    /* background-color: aqua;  */
    margin: 0 auto;
}
.right,.left{
    width: 700px;
    height: 200px;
    /* background-color: #212b38;  */
    float: left;
    margin: 25px;
}
footer{
    background: rgba(145, 145, 145, 0.735);
}
div>.right_1,.right_2{
    width: 120px;
    height: 120px;
    float: left;
    margin-top: 45px;
    margin-left: 150px;
}
.left_1{
    margin-top: 65px;
    margin-left: 300px;
}